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2.輸送含有固體顆粒或纖維的介質:輸送顆粒直徑可達30mm(不超過轉子偏心距),纖維長度可達350mm,其含量可達介質窖的40%,若介質中的固體物為粉末狀時,含量可達60%或更高也能輸送。要求輸送壓力穩定,介質固有結構不被破壞時,選用單螺桿泵為理想。 另外,除了能泵送各種介質,并且輸送過程平穩,連續,無脈動。單螺桿泵具有廣泛的壓力和流量范圍,流量可以從幾毫升每小時到500m3/h. 單螺桿泵的優勢及特點: ?能輸送高濃度,高粘度,高磨蝕性,高含固量,含有氣體,固體液體的多項混合介質; ?流量均勻,壓力穩定; ?泵的流量與轉速成正比,因而具有良好的變量調節性,并可達到計量的作用;
If you ignore the steam pressure, fluid dynamic friction loss and wellbore liquid pump suction, open an open chamber the maximum production pressure difference is 0.1Mpa, as long as the pressure drop between the inlet and the chamber to form a chamber is less than the pressure difference, the wellbore fluid will be filled with the chamber, then screw pump can achieve the displacement perturbation theory.當流體壓力降到蒸汽壓力以下,則出現氣蝕現象。如果一部分敞開的腔室被流體的蒸汽所充滿,當腔室封閉、轉子施加正壓力后,蒸汽則凝析,會使泵出現脈動和噪音。因此,為使泵能達到其理論排量和正常運轉,要求流體壓力大于其蒸汽壓力,并且吸入壓降小于